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Title: Determination of the critical micelle concentration in simulations of surfactant systems

Journal Article · · Journal of Chemical Physics
DOI:https://doi.org/10.1063/1.4940687· OSTI ID:1469187

Alternative methods for determining the critical micelle concentration (cmc) are investigated using canonical and grand canonical Monte Carlo simulations of a lattice surfactant model. A common measure of the cmc is the “free” (unassociated) surfactant concentration in the presence of micellar aggregates. Many prior simulations of micellizing systems have observed a decrease in the free surfactant concentration with overall surfactant loading for both ionic and nonionic surfactants, contrary to theoretical expectations from mass-action models of aggregation. In the present study, we investigate a simple lattice nonionic surfactant model in implicit solvent, for which highly reproducible simulations are possible in both the canonical (NVT) and grand canonical (μVT) ensembles. We confirm the previously observed decrease of free surfactant concentration at higher overall loadings and propose an algorithm for the precise calculation of the excluded volume and effective concentration of unassociated surfactant molecules in the accessible volume of the solution. We find that the cmc can be obtained by correcting the free surfactant concentration for volume exclusion effects resulting from the presence of micellar aggregates. We also develop an improved method for determination of the cmc based on the maximum in curvature for the osmotic pressure curve determined from NVT simulations. Excellent agreement in cmc and other micellar properties between NVT and NVT simulations of different system sizes is observed. In conclusion, the methodological developments in this work are broadly applicable to simulations of aggregating systems using any type of surfactant model (atomistic/coarse grained) or solvent description (explicit/implicit).

Research Organization:
Princeton Univ., NJ (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0002128
OSTI ID:
1469187
Alternate ID(s):
OSTI ID: 1236409
Journal Information:
Journal of Chemical Physics, Vol. 144, Issue 4; ISSN 0021-9606
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 42 works
Citation information provided by
Web of Science

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Cited By (10)

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Self-assembly of spiral patterns in confined systems with competing interactions journal January 2019
Predicting low-temperature free energy landscapes with flat-histogram Monte Carlo methods journal February 2017
Following the nucleation pathway from disordered liquid to gyroid mesophase journal April 2019
Non-equilibrium effects of micelle formation as studied by a minimum particle-based model journal May 2019
Simulation of diblock copolymer surfactants. I. Micelle free energies journal July 2019
Self-Assembly of Spiral Patterns in Confined System with Competing Interactions text January 2019
Aggregation Behavior of Medium Chain Fatty Acids Studied by Coarse-Grained Molecular Dynamics Simulation journal January 2019
Desorption of hydrocarbon chains by association with ionic and nonionic surfactants under flow as a mechanism for enhanced oil recovery preprint January 2017

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